Explorations of the Brno underground have been going on for more than three decades. During this time, a surprisingly large number of various underground objects have been discovered and statically secured, which have significantly enriched the knowledge and information about the history of the city. The vast majority of the underground structures found can only be familiar to the professional and general public through documents, photographs and informative texts. However, as research efforts have progressed over the last few years, there have been finds so significant and historically attractive that the intentions of experts involved in this activity have increasingly included considerations of their more interesting presentation. Some parts of the discovered areas have been presented to the public on several exceptional occasions. However, the interest in seeing them was so great that it could not be sufficiently satisfied. Extraordinary tours of the newly discovered underground objects followed at increasingly frequent intervals, yet the interest of experts and Brno residents alike continued to grow. The situation and several submitted studies on the use of the found spaces gradually convinced the city representatives of their attractiveness and the feasibility of their presentation. The efforts to make the Brno underground accessible culminated in 2008 with the preparation and implementation of a project called "Making the Brno Underground Accessible". From the most interesting historical sites that were offered, three objects were selected - the mintmaster's cellar on Dominikánské náměstí, the labyrinth of cellars under the Green Market and the ossuary at St. After thorough preparation and approval by the Brno City Council, the project was launched in 2009 with the financial support of the Regional Operational Programme of the European Union funds.
The mintmaster's cellar and the exhibition of cellars under the New Town Hall were officially opened to the public on 26 November 2010. They became the first permanent site of Brno's historical underground to be opened. At the beginning of 2011, the Labyrinth under the Green Market was completed and opened to the public. The last of the three underground areas of the Constance at St. James was completed and opened in 2012.
The history of Brno's underground is very rich and its extent is still growing with ongoing exploration. New discoveries and finds every year expand our knowledge and fill in the missing context about the time when these buildings were built and served their purpose. There is still plenty of evidence of the activities of our ancestors that Brno is gradually offering us through the underground. It is the memory of the city that presents us with a choice of what to preserve of the interesting part of history that lies beneath Brno's pavement.